package thread;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * 线程池
 */
public class ThreadPooDemo {
    public static void main(String[] args) {

        ExecutorService threadPool = Executors.newFixedThreadPool(3);
        for (int i = 0; i < 5; i++) {
            Runnable r = new Runnable() {
                @Override
                public void run() {
                    Thread t = Thread.currentThread();
                    System.out.println(t + "正在执行一个任务");
                    try {
                        Thread.sleep(5000);
                    } catch (InterruptedException e) {

                    }
                    System.out.println(t + "任务执行完毕");

                }
            };
            threadPool.execute(r);
            System.out.println("将第一个任务交给了线程池");
        }
//        threadPool.shutdown();
        threadPool.shutdownNow();
        System.out.println("线程池关闭了");
    }
}